Apparatus for producing molds for cast-iron pipes.



Patented Mar. l2, I90l.

E. FURSTEB. APPARATUS FOR PRODUCING HOLDS FOB CAST IRON PIPES.

(Application filed Oct. 31 1899.)

4 Sheels-Sheet l.

(No Model.)

[iii/eager. Z'rrzwi i320! e r WITNESE$ dLi/M.

m: mums wmns 50.. mo'rauwo" WLSHXNGYON. n. c.

I I Patented Mar. I2, I90l. E. FORSTER. APPARATUS FOR PRODUCING IAOLOS FOR CAST IRON PIPES.

(Application filed Oct. 81, 1899.)

4 Sheets-Sheat 2.

(No Model.)

IJI m-IEE WITNESSES.

1n: Noam PE E-1s 00,, FNDYOUfl QO-PVIASHINGTOK a. c.

No. 669,877. Patented Mar. l2, I901.

E. FURSTER.

APPARATUS FOR PRODUCING HOLDS FOR CAST IRON PIPES.

(Application Med Oct. 81. 1899.\

(N0 Model.)

five/afar:

Era-Zen WITNESSES- No. 669,877.- Patented Mar. I2, 190:. E. FOBSTER.

APPARATUS FORPRDDUCING HOLDS FOR CAST IRON PIPES.

(Application'filed Oct. 31, 1899.)

4 Sheets-Shet 4 {No Model.)

WITNESES.

m: nomus PETERS ca. moYmJmQ. wAsmue'rpm 04 c4 NTTnn STATES Y PATENT OFFICE.

ERNST FORSTER, OF ST: PETERSBURG, RUSSIA.

APPARATUS FOR PRODUCING MOLDS FOR CAST-IRON PIPES.

SPECIFICATION forming part of Letters IPatent No. 669,877, dated March 12, 1901.

i Application filed October 31, 1899 Serial No. 735,38fl. (No model.)

To all whom it may concern:

Be it known that I, ERNST FoRs'rER, a subject of the King of Saxony, residing at 4.3 Sagoroduiji-Prospect, St. Petersburg, in the Russian Empire, have invented certain new and useful Improvements in Apparatus for Producing Molds, (for which I have applied forpatents in Germany,dated August 19, 1899; in Austria, dated August 30, 1899, and in Hungary, dated September 1, 1899, No. 13,334,) of which the following is a specification.

This invention relates to an apparatus for the molding of tubes, pipes, and other articles of regular form and considerable length.

This invention is designed to produce at one operation any number of molds for tubes, pipes, and other articles of regular form and considerable length, as a general mold, without inclosing mold box or case, the castings made from such molds being perfectly seamless, as the molds are not divided either longitudinally or transversely.

In order that this invention may be the better understood, I now proceed to describe how it may be carried into effect, reference being had to the accompanying drawings and to the letters marked thereon.

Figure 1 is a part-sectional front view of the machine before commencement of the operation. Fig. 2 is a sectional view on the line A B of Fig. 1. Fig. 3 is a longitudinal section'of the machine in the first stage of the operation. Fig. 4 is a sectional view through the upper part of the mold, showing particularly the patterns for casting flanges or the like on the ends of the articles formed in the molds. Fig. 5 is an enlarged View of part of the machine'when the molding-cylin' der returns. Fig. 6 is a sectional view on the line B O of Fig. 5. Fig. 7 is a front view of the mantle-joint. Fig. 8 is a plan thereof. Fig. 9is a sectional view of the completed mold.

The machine consists, essentially, of two main parts, which are preferably arranged so that one is situated below and the other part above the floor of the works.-

The part above the floor consists, essentially, of two vertical standards a a, arranged one opposite to the other. These standards are close to the pit w, and each has a vertical barb, protruding over the pit, to guide the pressing and molding devices, which act as will be fully described hereinafter. Brackets c are fixed to the standards a and the side of the pit and protrude into the pit and serve to guide the molding device and as a support for a track (1, on which are carried stripping and supporting plates fof the molds to be made and which are removed with the completed molds by hand-propelled vehicles or other means. The stripping and supporting plates f have recesses n, corresponding to the patterns to be used, and projections g, by

or trucks e, constructed, preferably, of U- iron. Pipes h are screwed into the stripping and supporting plates f, such pipes consisting, if desired, of ordinary gas-pipes provided along their whole length with small side ori- With the stripping and supporting plate f corresponds a pressing-plate it, provided with arms Z, which exactly guide the plates on the bars 12. A rod m, fixed to the plate, can be raised and lowered under considerable pressure by any convenient source of power, preferably by hydraulic pressure.

The second principal part of the machine, which may conveniently be placed into the pit to, consists of a foundation-plate 0, fixed to a rod p, exposed to a force, preferably hydraulic pressure. To the plate are screwed four angle plates or Walls (1, forming a mantle or shell. The adjacent edges of the walls (1 are separated from each other to form slots extending along the whole length of the mantle and providing spaces through which the projections g on the four sides of the stripping and supporting plate f may extend, thus allowing the mantle to move freely up and down without interfering with the stripping and supporting plate, which rests stationary on the truck e. At the sides of the mantle adjacent to the guides b the walls or anglepieces (1 are formed with parallel flanges g, which engage the guide-bars and slide thereon to guide the vertical movement of the mantle. The height of these angle pieces q depends upon the height of the articles to be cast from the molds. To the plateo are also screwed the patterns 1" for the molds to be formed, which fill the space at regular intervals and correspond to the holes of the plate f.

The action of the machine is as follows:

fices a; and threaded at their upper ends..

which latter they are screwed to the vehicles When the vehicle or truck e,with the platef fixed thereto, is brought into correct position between the standards a, the plate 0, with patterns and mantle, is pressed upward so far that the patterns 7 and the mantle formed by the angle-pieces q protrude about three inches over the plate f, Fig. 3. Removable strips or long plates 5 should now be inserted into the slots in the mantle formed by the edges of the angle-pieces (see Figs. 5 and 6) in order to prevent the escape of sand to the slot during pressing, and these strips are held firmly in place and all the parts of the mantle connected together by a joint, Figs. 7 and 8, in the form of bolts and nuts 8 to prevent the expansion of the mantle during pressing. The molders sand is then thrown in any suitable manner into the space formed by the mantle, gas-pipes, and patterns, and the plate is presses the same to a certain degree. The plate 70 then remains in position and the plate 0 is pushed farther, say about half the distance of the first operation. then raised again the hollow space filled again with sand, and these operations are continued until the desired height of mold is reached.

As the mold is thus built up the strips or plates 3 should be removed and replaced by other similar strips or plates longer than those first used, so that the mantle at the points above the stripping-plates f is always closed on all sides. The gas-pipes h are orificed, as

.shown, to permit the escape of gas from th plate 6. When the mold is being formed, the

patterns r are pressed into place by the plate is. These parts produce a mold of the form shown in Fig. 9. Before the final pressing operation a plate 6 has to be placed on the mold, having perforations corresponding to the patterns and gas-pipes, which remains in place after the final pressing and is attached by nuts, which are screwed to the screw-threads of the gas-pipes. The sockets or flange patterns are pressed on with the plate 25, for which purpose the holes of this plate must correspond to the outer diameters of the sockets or flanges to be cast. The plate 25 serves for the exact centering of the cores and to give increased stability to the mold by the screw connection between the gas-pipe and the platef. The last step of the operation is to bring the mantle and patterns slowly down into the first position, which is to say below the vehicle, during which action the wedges s and the connecting-bolts 8, Figs. 7 and 8, engage the projections g and are displaced from the mantle by the downward movement thereof, the mold now resting on plate f, and truck is then complete. (See Fig. 9.)

For casting the dried mold is inclosed in an iron shell or chill and the cores are inserted. For centering the same grooves are The press-plate 7c is made into the plate 25, in which the cores are centered. The cores are made in the usual manner, which does not form part of my invention.

The time required for making a mold, say, for sixteen pipes, &c., does not exceed twenty minutes, so that the great advantage. of the invention is evident. Further advantages are the great exactness and accuracy, the prevention of so -callec seams, and the omission of mold-boxes inclosing the molds, thus allowing the mold to dry more rationally, as the gases of combustion can play on it from all sides.

What I claim, and desire to secure by Letters Patent of the United States, is

1. In an apparatus for producing molds, the combination with a carriage having a stripping and supporting plate with an opening, of a plunger mounted above the carriage and moving toward and from the same, a second plunger mounted below the carriage and also moving toward and from the same, a pattern carried by the second plunger and movable upward through the opening in the stripping and supporting plate, and walls or mantles carried by the second plunger and also movable upward outside of the foundationplate to form the walls of an inclosure in which the mold is compressed.

2. In an apparatus for producing molds, the combination of a stripping and supporting plate having an opening therein, a plunger mounted above the stripping and supporting plate and movable toward and from the same, a'second plunger mounted below the stripping and supporting plate and also movable toward and from the same, a pattern carried by the second plunger movable upward through the opening in the stripping and supporting plate, and walls or mantles carried by the second plunger and movable upward outside of the stripping and supporting plate, to form an inclosure in which the mold is compressed.

3. An apparatus for compressing molds, the apparatus having a stripping and supporting plate, a plunger mounted above the same, a plunger mounted below the plate, and walls or mantles carried by the second-named plunger and movable upward outside of the stripping and supporting plate, to form an inclosure in which the mold is compressed.

4. In an apparatus for producing molds, the combination with a carriage, of a stripping and supporting plate supported therein by means of arms or projections extended inward from the carriage and fastened to the edges of the stripping and supporting plate, walls or mantles mounted below the stripping and, supporting plate and spaced from each other, the walls and mantles being movable upward past the side edges of the stripping and supporting plate and between the arms or projections, to form an inclosure around the stripping and supporting plate, in which inclosure the mold is pressed, wedges capable of being removably fitted in the spaces be- 1o inclosing the said means for sustaining the mold, and a second plunger movable down within the mantle and over the means for sustaining the mold to compress and form the 'mold.

In testimony whereof I have hereunto set I 5 my hand in the presence of two witnesses. ERNST FORSTER. Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

